Thank you, problem has fixed.

Thank you for reply. I've uploaded attachment. Rectangles are visible only in some zooming.

generatemutate wrote:possibly the 'greys' are on a different layer?
a work around could be to copy everything you want to a blank document.

There are gray rectangles in new document too.

Goog evening,
there are some gray rectangles in my picture, which I can't delete them and I didn't create these shapes. There are in export picture too. Do you know what are they and how I can delete they?
Thank you,
Knezi.
p.s. I'm sorry for my bag English.